Five talking points ahead of Chelsea v PSG

Chelsea play Paris St Germain in the Champions League last-16 second leg on Wednesday night. PSG won the first leg in Paris on February 16 2-1. Here Press Association Sport looks at some of the talking points ahead of the clash at Stamford Bridge.

HISTORY REPEATED

Chelsea and PSG meet in the knockout stage for a third successive year. Each time the second leg has been in London, with Chelsea winning the 2014 quarter-final tie on away goals after a late strike by Demba Ba. Twelve months ago, former Chelsea defender David Luiz forced extra-time and Thiago Silva netted the decisive goal. Who will be the hero this time? John Obi Mikel's away goal could be key for the Blues as one goal will be enough provided they do not concede.

TROUBLE WITH TERRY

Chelsea captain John Terry has missed the last five matches with a hamstring injury. The first in that sequence was the first leg in Paris, which Chelsea lost 2-1. Right-back Branislav Ivanovic has switched to the centre in his absence and his partnership with Gary Cahill - selected since Kurt Zouma's season-ending knee injury - has been good in recent weeks. The concern is the knock-on effect of Terry's absence at left-back, where Baba Rahman has been less than convincing.

UNBEATEN BLUES

Chelsea's only loss in 16 matches under interim boss Guus Hiddink - and 17 since Jose Mourinho's sacking - was the first leg at Parc des Princes. Yet the Blues have had the benefit of good fortune and marginal calls from the officials, including last Tuesday at Norwich when Diego Costa scored from an offside position. Hiddink and Chelsea will hope luck is with them once again. It was not in his only other defeat in 38 matches as Chelsea boss, the controversial Champions League semi-final defeat to Barcelona in 2009 which is etched in the memory of fans.

LUIZ LIFT

David Luiz, who left Stamford Bridge for PSG ahead of the 2014 World Cup in a Â£50million deal, played like a man possessed in last season's second leg, raising his game against his former employers before scoring a key goal. He had vowed not to celebrate if he scored, but did so with gusto. Chelsea will need to keep Luiz on the back foot and test his defensive vulnerabilities, rather than allow him to show his ball-playing talent.

DIEGO DOES DAMAGE

Diego Costa missed last Saturday's draw with Stoke as a precaution and will be chomping at the bit to return against PSG. The striker had a woeful start to the season, but has netted 10 goals in 14 games under Hiddink. The Dutchman seems to have helped Costa change his focus from antagonising opponents to scoring past them. Costa's European record could improve, though. He has just one Champions League goal for the Blues.